Re: V-Ray/Blender 2.57
So: in Simple mode just the environment is taken into account; in normal portal mode - object behind the portal are also taken into account.
Skylight portal - when this option is on, the Color and Multiplier parameters are ignored; instead the light will take its intensity from the environment behind it.
Simple portal - this option is only enabled if the Skylight portal option is on. It tells the VRayLight that there is nothing of interest behind the light itself, and so the environment color can be used directly. Normally, the portal light takes its color from whatever objects are behind it. In order to do this, the light traces additional rays, which may slow down the rendering. Turning this option on makes the rendering of portal lights faster.
Simple portal - this option is only enabled if the Skylight portal option is on. It tells the VRayLight that there is nothing of interest behind the light itself, and so the environment color can be used directly. Normally, the portal light takes its color from whatever objects are behind it. In order to do this, the light traces additional rays, which may slow down the rendering. Turning this option on makes the rendering of portal lights faster.
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